When installing your email signature into the Outlook App for iOS, you will need to use the HTML source code of the email signature, rather than copying the signature itself.
Email the signature to yourself and open the shared signature link on your phone.
If you’ve received a shared signature link, simply open it.
Tap on the pencil icon on the left of your screen to open the side menu.
Tap the “Click Here if you need the HTML source code (advanced)” to open a new window with the HTML source code.
Hold down your finger and select all the source code in the window and then tap “Copy”.
Open the Outlook App on your iPhone/iPad. Tap the menu button from the top left.
Tap the settings gear icon on the bottom left of the menu.
When you’re in the settings menu, tap on the signature section.
Press and hold over the email signature area, paste the HTML source code of your new signature.
Click back and close out of the settings window.
Your email signature is now installed!